This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 8 |
| 6 | 61 |
| 7 | 136 |
| 8 | 1385 |
| 9 | 3968 |
| 10 | 50521 |
| 11 | 176896 |
| 12 | 2702765 |
| 13 | 260096 |
| 14 | 199360981 |
| 15 | 951878656 |
| 16 | 19391512145 |
| 17 | 104932671488 |
| 18 | 2404879675441 |
| 19 | 14544442556416 |
| 20 | 74074237647505 |
| 21 | 2475749026562048 |
| 22 | 69348874393137901 |
| 23 | 507711943253426176 |